Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
thuc va » thuc vat, thuc dan, thuc day
han tai » hang tai, nhan tai, van tai
te sach » toc sach
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi
o hoi » o hoc, o hai, o hoa
ve am » va am

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ((o hoi) OR (co hoi)). hieu ve am thuc va ((hanh dai) or (han tai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((o hoi) OR (co hoi)). hieu ve am thuc va ((hanh dai) OR (han tai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((o hoi) OR (co hoi)). hieu ve am thuc va ((hanh dai) or (han tai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((o hoi) OR (co hoi)). hieu ve am thuc va ((hanh dai) or (han tai)) cua triet*.